LAGOS, Nigeria -- Shaking a finger while cradling an assault rifle, the bearded leader of Nigeria's extremist Islamic sect threatens to burn down more schools and kill teachers. But he denies his fighters are killing children.

In a new video released Saturday, Islamic radical Abubakar Shekau said he "fully supports" attacks on several schools in northeastern Nigeria in recent weeks.

The United Nations Children's Fund says at least 48 students and seven teachers have been killed since June, with some burned alive in a dormitory this month.

"We support the work they did at the school, at Mamudo and Damaturu, and other attacks in other schools," said Shekau, who wore military fatigues in the video. "We are going to burn down the schools, if they are not Islamic religious schools for Allah."

But Shekau insisted his fighters do not kill children.

"We don't touch small children, we only burn the schools," he says. "Our religion does not permit us to touch small children and women, we don't kill children."

He said his fighters would, however, attack teachers. "School teachers who are teaching Western education? We will kill them! We will kill them!" he warns, wagging his finger.

President Goodluck Jonathan declared a state of emergency on May 14 in the three northeastern states of Adamawa, Borno and Yobe.

In the video, received by The Associated Press through intermediaries, Shekau also speaks in English to denounce the West, accusing it of trying to destroy Islam and working "to tactically make the Quran insignificant and unimportant."

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